Overview
Dextrin glue is a starch-derived adhesive widely used in corrugated cardboard production thanks to its fast tack, good bonding strength, and low cost. This article explains the essential steps of manufacturing dextrin adhesive for corrugated cardboard, including preparation, cooking, modification, and quality control.
What is Dextrin Glue for Corrugated Cardboard
Dextrin glue is an adhesive produced by the controlled hydrolysis of starch.
It is water-based, biodegradable, economical, and ideal for high-speed corrugating lines.
Steps to Manufacture Dextrin Glue for Corrugated Cardboard
1. Ingredient Preparation
-
White or yellow dextrin powder
-
Water
-
Caustic soda (alkaline agent for viscosity development)
-
Borax or buffering agents
-
Plasticizers (optional)
-
Preservatives (optional)
Ensure all raw materials are dry, contamination-free, and measured according to formula.
2. Initial Mixing
-
Add water into the mixing tank.
-
Begin agitation to create a vortex.
-
Slowly add dextrin powder to prevent lump formation.
-
Maintain moderate mixing speed until uniform slurry forms.
3. Alkaline Activation
-
Add caustic soda solution gradually.
-
pH increases, allowing dextrin molecules to swell and improve tack.
-
Continue mixing until the adhesive becomes smooth and homogeneous.
4. Viscosity Adjustment
-
Add borax or other crosslinking agents to modify viscosity and tack.
-
For higher solids & stronger bonding, increase dextrin concentration.
-
For better spreadability, add more water.
5. Optional Additives
-
Plasticizers → improve flexibility.
-
Antimicrobials → extend storage life.
-
Anti-foaming agents → reduce air bubbles.
6. Quality Control Tests
Key parameters to check:
-
Viscosity (Brookfield)
-
pH
-
Solids content
-
Bonding strength
-
Drying time
Adjust formulation if required.
7. Filtration & Packaging
-
Filter the adhesive to remove impurities.
-
Fill into airtight containers to prevent microbial growth.
-
Label, store, and ship.
Summary
Dextrin glue for corrugated cardboard is produced by hydrating dextrin powder, activating it with alkaline agents, adjusting viscosity with crosslinkers, and adding optional modifiers. The process is simple, economical, eco-friendly and ideal for industrial corrugated board applications.
